I'm in Central Illinois - and I believe you can also use the long day varieties in Ohio as well.

I've always used bulbs but this year I gave seeds a try - and started with the highly regarded Copra Onion seeds because they are "rock hard" with excellent storage.

This year I'm going to try "Varsity Onion" which is sold by FedCo Seeds. The catalog said they average 12 - 16 ounces in size and can get as large as 1.5 pounds each with the same storage capabilities. So Copra and Varsity will be tried this year to see if there is much difference between the two.

Here is a link that might be useful: BsnTech Gardening Blog

For a yellow onion, there is little doubt that Candy is always a winner. It is large, sweet, and keeps moderately well. I buy plants in bulk from Dixondale's and always plant about a case and a half alone of Candy. I, too, like Copra as a storage onion. Depending on the year, Ailsa Craig and Red Torpedo (Tropea)have been good as well for really giant onions. For green onions, I simply buy the cheapest sets I can find. Buy extra and store some in the fridge for fall planting as well. If you buy seed, make sure it is very fresh because onion seed does not keep well.

Brook